Printing-telegraph system with way stations



Dec. 20,1927.' l Y l D. syHULFISH PRINTING 'TELEGRAIH s'YUsTEM WITH WAY STATIONS l Filevd'oo't. 15.'.1926- I7?. Vent-of:

YParenteel Dee, 20, '1927.

unirse stares -PAraNr OFFICE.

DAVIDS. HULFSH, OF` TORONTO, ONTARIO, CANADA.

PRINTING-TELEGRAPH SYSTEM WITH WAY STATIONS.

Appncauon fnea october 15, 1926. serial No. 141,773.l

by printing telegraph, wayst'ationsy which have a. lovv volume o'f traffic, using a minimum ofequipment at each waystation, and imposing. at each vvaystation a minimum burden of electrical constants in the line circuit. The manner in which this object is accomplished is (a) to provide a main-line circuit from a first station or head ofiice and extending through waystations to a terminal which may or may not be another head oiiice; (b) to provide a sole Winding of 'a sole line relay in that circuit at each waystationl; (c) to make all local automatic functions at the waystation dependent upon that relay and controlled by it; (al) to cause to rlow in that circuit a signaling current primarily under control of the head oiiice and secondarilyv modified by control of any waystation; (e) to transmit intelligence by printing telegraphy from the head oiice to any waystation by modifications in that current, such modifications originated at the head oliice and controlled solely at the `head ottice; to transmit intelligence by printing telegraphy from any waystation tothe head ot'- fice by modiications of that current, such modicationscontrolled jointly bythe Waystation andthe head otiice; (g) to providesignal-sending means for service-signals in'connection with a waystation receiving device and controlling signal-receivingmeans at-the head oiiice, whereby the head oiiice When sending a' message to a waystation may receive a response-signal and thereby be advised that the Waystation receiving device is operating in response to the head-office control; (it) to send amessage to a. waystation and to receive'a message from the same Waystation at the same time without interference; (i) to send a plurality of messages .to sundry Waystations, and to receive a plurality of messages from sundry W'aystations, all at the same time and without interference, together with the response-signaling according to (50 from each receiving waystation independently; (j) to provide forl making waystation modifications in the line current between successive signals as made by the head-ottice signal devices, whereby unitary signals of polar and neutral or strength n ature may be coincident and simultaneous; (lo) to provide a system of phase correction `ate by eii'ective tocorrect the phase of a distributer throughout a maximum angle; (m) to opera sole distributer brush all of the functions of receiving, sending, synchronizmg and response-signaling at the Waystation; (n) to provide means for preventing interference between Waystations; (o) to provide a starting cam with contacts interchangeably used for charging the starting magnet'oi:l the sender and for charging the starting magnet of the printer; (p)to prolvide a service channel into the head ofiice and control of the message channels, together with supervision of the message channels;

and (g) to supply all line currents for any liirie from a single source located at the head o ce.

vIn the drawings, Fig. 1 shows circuits for. a system of. one lin'e comprising a'head oice and three waystations and terminal earth connection.; Fig. 2 shows a modification of the circuits for the head ottice; Fig. S-showscircuits for a waystation; and Fig. 4 shows detail for another waystation.

The invention is exemplified herein by` a. system of polarity-and-strength duplex or diplex working, in which the head otiice supplies a continuous current which is varied in two characteristics, being (1) reversed 'in polarity by the senders at the head oiiice to signal the Waystations by polar control,` and being (2) varied in' strength by the senders at the Waystations by effect of including or removing resistance in the line circuit to siget;A

nal the head oiiice by neutral control. Polar channels A, B, C are used for messages from the head 'office and polar channel D is used for synchronizingg-neutral channels A, B, C

are used for messages to the head oice andv neutral channel D is used for response sig-y naling.

Referring to Fig. 1: The sending distributer 10 serves four channels, of which A, B,

'C are served also by the senders 11, 12, 13,

positive battery P, thus providing a polarity reversal for phase correction of the waystation distributers as 44.

The line circuit comprises a battery, vP or N; the senders; the distributer 10; thejwire 19; the marginal, neutral, receiving relay 20; waystations 21, 22, 23; and the line wire 24:,

in sections, connecting in sequence its head oilice, its waystations and its terminal earth.

.Inthis line circuit, a line current flows con-l tinuously," as modified by the senders of the system.v If the terminal earth of the line .wire 24 be in the same office with the distribcomprises sender 11 and waystation 21, and 4 it is associated,withresponsesignal devices of signal-point 34- in the distributer. Polar channel B comprises 'sender 12 and wayst-ation 22, and its response-signal is over signal-point 35. Polar channel C comprises vsender 13 'and Waystation ,23, and its response-signal is over signal-point 36.`

vThe head oice receiving equipment comprises the relay 20, the distributer 30, the printers or recorders, 31, 32, 33, and the three response-signal sets, each comprising a; polarrelay as 38 and a signal as 37, the

three relays connected respectively' to points 34, 35, 36 and controlling the three signals respectively.`

' The differential relay 20. and balancing network of Fig. 2 may be substituted for thel marginal relay of Fig. 1.

. Referring to Fig. 3: The equipmentof the :wa station 21, connected to polar channel A an neutral channelC, is shown. "The line relay 40 responds to P current from distributer 10 and places earth upon wire 41 for messages and uponv wire 42 lfor `synchronizing. The brush 43 ofthe distributerv l44 will gain (or lose) "phase as compared with the vbrush of Ydistributer 1 0, until the brushes are in phase on points 45 and 18 respectively, after which the break relay 46 and the phase corrector magnet 47 will maintain synchronism.

All of the brushes of the line operate in sy'nchronism, and while .all brushes are on' channelA the relay 40 and the brush43 will record upon thexprinter 48 all signals sent from sender 11.` While all ,brushes are on channel C, the

relay 20 and distributer-30 will record upon printer 33 `all signals sent fromlsender 49.

The manner of sending signals from the i sender 49 to the relay '20 is as follows l: The

cam y5() on distributer shaft 51 -moves inA phase with brush 43. Its low-radius arc 52 permits cam-controlled .shunt points 53 to` open` while brush 43 is upon the points of channel C iii-distributer 44. With .the shunt 53 open, the sending line-resistance 54 lis shunted by the path comprising .wire 55, wire 56, brush 43, contacts in sender 49 and wire 57.v With aperforated .tape in the sender 49, selectedpoints-in the sender 49 will be open by the tape code, and when the lbrush 43 engages such an open sender-point,

all the shunts of the resistance 54 will be o en, vand the sending resistance 54 without As unt will be` included in the line circuit, the

line current will be'decreased and the marginal (or dierential) relay 20 (or -20)`- will operate its armature. This will connect P battery to the corresponding Wire into the printer 33 and the signal of the sender 49I will be recorded. This will be eii'ected (over neutral channel C) even thoughthe head office may be sending at the same time to waystation 23 (over polar channel C) 0r to Waystation 21 (over polar channelA). Nor

.will there be any interference if the 'six channels shown, three polar and three neutral, all operate at the same time.

Because all brushes of the line are in Synv chronism, all-unitary signals will be in synchronism, and the polar changes in the line current 'will occur simultaneously Withthe strength changes in the line current.

has two low-radius arcs (contiguous in Fig.

1) the arc 52 for opening the shunt points.'

-53 during the sending interval, .and the arc 58 for opening the shunt points 53 during the response-signal interval. The cam 50 of Fig. 4 isv-cut for station 23, which sends on channel B and which reports the operation of its printer by a response-signal on the third time unit 'of neutral channel D.

The receiving and sending connections vary at the several waystations. At waystation 21, the printer48 is connected tothe signal-points of channel A and its startingmagnet 64 is connected tovpoints 61' to-be closed by cam 60 immediately after thedistributer brush 43 has leftmchannel A. At station 22, the printer is connected to the points of channel B and its starting magnet is connected to points 62 to 'be closed by cam 60 immediately after the distributer. brush has left channel B. At stationl 23, the printer yis connected to the points of channel Cand its starting magnet is connected to points 63 to be closed by camV 60 immediately after the distributer brush has left the channel C. At station 21, the sender 49 is connegted to the points 'of the channel C and its startingmagnet 5.9 is connected to points 63 vto be closed immediately after the distributer 'brush'43 has left the channel C. At station.

22, the sender is connected' to the points of brush has left the channel A. At station 23, the sender is connected to the points of channel B and its starting magnet is connected to the points 62 to be closed immediately after the distributer brush has left the channel B. Thus the points, 61, 62, 63 are used alternatively for the starting magnet of the printer or for the starting magnet of the sender according to the linechannels serving the station. i

Every impulse froml cani to the starter magnet 64 charges also the reporting relay 65, which has an armature retarded sufficiently to be retained continuously when an impulse is received for every revolution of the distributer shaft 51. The points of relay 65 are connected respectively to wire 57 and to point 67 in the distributer 44. The distributer point 66 is connected by wire 68 to wire 55. With printer 48 not operating and with all brushes on the rst time unit ofA channel D, the cam 50 of station 21 opens y the shunt points 53 by effect of its lowradius arc 58; the resistance 54 is shunted by the path, wire 55, wire 68, point 66, brush' 43, point 67, wire 70, points of uncharged relay 65, wire 69 and wire 57; the line current remains strong, relay 20 does not move its armature, vand gives N battery to relay 38; the lamp 37 remains dark. With printer y 48 operating repeatedly relay 65 retains its points open continuously, and at each repetition of the first time unit of channel D, all shunts of the resistance 54 are open, the line current is decreased, and-relay 2() (or 20') operates its armature to give P battery to relay-38, which closes its points, and lamp' 37 glows continuously. At waystation 22, the wires 68 and 70 are connected to the points of the second time unit of channel D; and at waystation 23 the wires 68 and 70 are connected to the4 thirdpoints of channel D.

Should the head ottice, on operating the sender 11, note that a signal is not received on lampA 37, the deduction may be that the waystation 21 is not in phase. With the head-oiice distributer running 200 revolutions per minuteand the waystation motor running 201 R. P. M., the brush 43 will require one minute for a maximum correction. The head ofiice may await synchronism by chance or may expedite it by stopping all polar channels for that length of time, when transmission may be resumed andthe response-signal should be received on the lamp 37. y y,

The total function ofthe camv 50 is to remove Ithe line resistance 54 'fromthe' control of other equipment of its waystation during the time intervalswhen the line is reserved for ythe use of other waystations, and to 'subject the line resistance to the control of the sender when the' line is "reserved .for the use of that sender.' By the cam 50,

but one line resistance as 54 `may be included in the line circuit at any one time, even though two or more waystations may be sending messages to the head oice.k

Having thus described my invention, what` I claim is:

1. `A printing telegraph system, comprisy ing a polar sender; a strength sender 1ocated remotely from said polar sender; a polar receiver; astrength receiver; a line-- circuit ;fand a sole source ot' polar line-currents serving the system.

A 2. A duplex printing telegraph system,A comprising a first sender; a tirst receiver; a second sender; a second receiver; a linecircuit and a sole source of line-currents; said first sender for modifying one characsender for modifying another characteristic of the line current, said senders remote from each other and one of said senders remote from said source. .l

3. In aprinting telegraph system, a head oliice; a sending distributer at said head oiiice; a line; polar senders controlling transmission channels through said distributer; waystations; distributers at saidwaystations controlled by currents in said line; means, at said head oiiice solely, for producing currentsl in said line; strength senders at said waystations for modifying the 'teristic ofthe line-current and saidsecond v v strength of the currents produced in said line by said .means the polarity of the currents having 'been determined by ,said polar senders; and strength-signal receiving devices at said head otlice.

4.111 a printing telegraph system, a head office; polar senders at said head oiice; a

sending distributer at said head otiice; a line; waystations; polar distributers and printers at said waystations; means at said head oihce only for producing line currents in 'said line; strength senders comprising.

variable series line resistances at said wayf stations to modify the strength of the line-i currents Whose-polarity has been determined by'v the polar senders at the said head otlice; and a strength receiver at said head otEce.

5; Ina printing telegraph system, a first station; a second station; a line-circuit connecting them.; a source of potential to produce in said'line-circuit a line-current hav# ing. a predetermined direction of polarity; a

source of potential to produce in said linecircuit a line-current having the reversed direction of polarity; a pola-r sender at said y 'iirst station, said sender combined with both of said sources of'potential to constitute a sole source of polar line-currents in said linecircuit; a polar receiver; a strength sender for varying the-strength of the polar linecurrents in said 'line-circuit; and a strength receiver.

' 6. In a 'printing telegraph system, a head office; a waystation; a line-circuit connecting them; asole source of line-current; a

polarity-changing sender at said head office;

a polar line-relay 'at said Waystation; a resistance-chan in sender at said waystation;

and a neutra` -re ay at said head office; all co-operating to produce duplex transmission using current from a single source varied in two characteristics.

7. In a printing telegraph system, a first station; a plurality of distant stations; a line; a sole source of line-Current; means for transmitting from said first station' to a distant station by polarity control; and means for transmitting from a distantstation to said first station by strength Control of'curf rents from said sole source.

8'. In a printing telegraph. system, a first office; a second office; sending means at said first office; receiving means at said second office ,and a vsignalreceiving device at said first office and voperated by said vreceiving means. u

9. In 4a printing telegraph system, a first office; other ofces; a line-circuit connecting said offices; a sender vat said .firsteoffice; receiving devices in said other offices responsive -to said sender; means associated with cach said receiving device for sending a sig- Vnal when said receiving device is operating;

and signal devices in said first office responsive to said means, one for cach of said other ofces.

10. In a printing telegraph system, a first office; a second office; a line circuit connect-v `and a strength-responsive device at said sender and connected by said line circuit.

12. Ina printing telegraph system,'a recording device; signaling means in said recording device; and means for rendering said signaling means operative when said recording device is operating.

signal.

13. In.. a printingl telegraph system, -a 4 sender; a signal at said sender; a receiver; and means at said receiver foroperatmg said 14. In a printing telegraph system, a. line; a station; a distributer of multi-channel type at said station; al recorder at said station associated through said distrihuter with one of the channels of said line; a sender at said station 'associated through said distributer With another of the channels of said line; and a sole brush in said distributer serving bothsaid sender and said recorder.

15. In a synchronous-multiplex-telegraph system, adistributer; a brush in said distributer; a line; a sender; and a recorder, said sender and said recorder alternately connected to said line by said brush.

16. In a printing telegraph system, a combination' distributer for a receiving channel and for a sending channel';`.a brush in said distributer, said brush serving both channels alternately.

17. ln a printing telegraph system,l a comi bination distributer serving a plurality of channels in rotation; a sole brush in said distributer and servingI a receiving channel and a sending channel alternately.

18. In a prlnting telegraph system, aline;

a` sole source of current in said line; a 'p lul' rality of' resista-neas in said Aline; a `distributer with each of' said resistances; a4

sender with each of said resistances for sendf ing signals over said line by varying' its n associated resistance; anda disabling device for each of said resistances, all of said disabling devices cooperating to enable said resistances to function oneat a time.

19. In a printing telegraph system, a line; a plurality ofvvaystations connectedto said line; sending resistances; ajs'endi-ng-resistance shuntv at each Waystation; said shunts cooperating to shunt all but one of saidsending resistances at all times. l

20. In a printing telegraph system, 'a plu-` l rality of waystations; distributers at said Waystations; senders at said Waystations; a plurality of sender-disablingmeans at said Waystations, said several disabling means cooperative to disable all at all times. y

DAVID s. HULFISH.

said senders but y one 

